North Korea has opened a sea route on the western coast to allow humanitarian aid, marking the first known border opening after the country shut its boundaries with the outbreak of the Covid-19 pandemic.

"The sea route from China's Dalian to Nampo has been opened," said Oren Schlein, the head of the Seoul Unicef office.

He was speaking during a peace conference in Incheon, west of Seoul, Yonhap news agency said.

“Some medical supplies have been shipped (to North Korea), and more will be delivered.”